AISC 360-22 · §J2 · LRFD · Imperial

AISC 360-22 Fillet Weld Sizing Calculator

φRn per inch with directional strength increase (1 + 0.5 sin1.5θ). E60XX–E100XX electrodes. Min/max leg size checks. Kips and inches throughout.

AISC 360-22 §J2 E60XX–E100XX Directional factor Min/max leg check LRFD φ = 0.75 Free · No signup
Inputs — AISC 360-22 §J2
a P θ=90° L (weld length)
Results — φRn LRFD §J2
FEXX 70 ksi
Effective throat 0.221 in = 0.707·a
Directional factor 1 (1 + 0.5·sin1.5θ)
φRn per inch 6.96 kips/in · §J2.4
φRn total 83.52 kips
Leg size checks
✓ a ≥ amin (Table J2.4) 0.188"
✓ a ≤ amax (§J2.2b) 0.313"
Utilisation P / φRn 72%
✓ OK

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Frequently asked questions

What is the directional strength increase for fillet welds in AISC 360-22?
AISC 360-22 §J2.4(a) allows a directional strength increase of (1.0 + 0.50·sin^1.5(θ)) where θ is the angle between the resultant load direction and the weld axis. At θ=90° (transverse loading), this gives a factor of 1.50, increasing the capacity by 50% over longitudinal (parallel) loading at θ=0°.
What is the resistance factor φ for fillet welds?
φ = 0.75 for weld metal shear per AISC 360-22 §J2.4. The same φ applies to base metal shear yielding (§J4.2) and rupture. For ASD, Ω = 2.00.
What is the minimum fillet weld size per AISC?
AISC 360-22 Table J2.4 specifies minimum leg size based on the thinner part joined: ≤1/4″ → 1/8″ min; >1/4″ to 1/2″ → 3/16″ min; >1/2″ to 3/4″ → 1/4″ min; >3/4″ → 5/16″ min.
What is the maximum fillet weld leg size?
AISC 360-22 §J2.2b: for plates thinner than 1/4″, the max leg = t (plate thickness). For plates 1/4″ and thicker, max leg = t − 1/16″. This ensures the plate edge is not melted through.
What is E70XX electrode, and when should I use E80XX or higher?
E70XX (70 ksi FEXX) is the standard structural electrode and matches A36 and A572 Gr50 base metal. E80XX and higher are used with high-strength steels (A913, A992 Gr65, A572 Gr65) where the base metal Fu exceeds what E70 can match. Always check that the electrode strength is compatible with both the base metal yield and ultimate strength.